var us_borders = {
'AL': ['MS','GA','FL','TN'],
'AK': [],
'AZ': ['NM','UT','NV','CA'],
'AR': ['MS','LA','TX','OK','MO','TN'],
'CA': ['OR','NV','AZ'],
'CO': ['NM','UT','WY','NE','KS','OK'],
'CT': ['MA','RI','NY'],
'DE': ['NJ','PA','MD'],
'DC': ['MD','VA'],
'FL': ['GA','AL'],
'GA': ['FL','AL','TN','NC','SC'],
'HI': [],
'ID': ['MT','WY','UT','NV','OR','WA'],
'IL': ['IN','KY','MO','IA','WI'],
'IN': ['MI','OH','KY','IL'],
'IA': ['MN','WI','IL','MO','NE','SD'],
'KS': ['NE','MO','OK','CO'],
'KY': ['OH','WV','VA','TN','MO','IL','IN'],
'LA': ['AR','MS','TX'],
'ME': ['NH'],
'MD': ['DE','PA','WV','VA','DC'],
'MA': ['NH','RI','CT','NY'],
'MI': ['OH','IN','WI'],
'MN': ['WI','IA','SD','ND'],
'MS': ['TN','AL','LA','AR'],
'MO': ['IA','IL','KY','TN','AR','OK','KS','NE'],
'MT': ['ND','SD','WY','ID'],
'NE': ['SD','IA','MO','KS','CO','WY'],
'NV': ['ID','UT','AZ','CA','OR'],
'NH': ['ME','MA','VT'],
'NJ': ['NY','DE','PA'],
'NM': ['CO','OK','TX','AZ'],
'NY': ['VT','MA','CT','NJ','PA'],
'NC': ['VA','SC','GA','TN'],
'ND': ['MH','SD','MT'],
'OH': ['PA','WV','KY','IN','MI'],
'OK': ['KS','MO','AR','TX','NM','CO'],
'OR': ['WA','ID','NV','CA'],
'PA': ['NY','NJ','DE','MD','WV','OH'],
'RI': ['MA','CT'],
'SC': ['NC','GA'],
'SD': ['ND','MN','IA','NE','WY','MT'],
'TN': ['KY','VA','NC','GA','AL','MS','AR','MO'],
'TX': ['MN','OK','AR','LA'],
'UT': ['ID','WY','CO','AZ','NV'],
'VT': ['NH','MA','NY'],
'VA': ['MD','NC','TN','KY','WV'],
'WA': ['ID','OR'],
'WV': ['PA','MD','VA','KY','OH'],
'WI': ['MI','IL','IA','MN'],
'WY': ['MT','SD','NE','CO','UT','ID']
}